Stoker grate



Patented May 1, 1923.

ourrso fiTATES PATENT @FFHCB.

STOKER GRATE.

Original application filed January 23, 1920, Serial No. 353,423. Divided and this application filed December 28, 1920.

To all whom it may concern:

Be it known that I, GEORGE H. THACHER, J12, a citizen of the United States, residing at'1546 Smith Street, North Providence, in the county of Providence, State of Rhode Island, have invented certain new and useful Improvements in Stoker Grates; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. 7

My invention is an improvement in stoker grates of the general type shown in my Patent No. 1,302,453, granted on April 29, 1919, wherein the stoker includes stoker bars and cleaning grates mounted to rock on inclined bearing-bars extending from the front to the rear of the furnace and the present application is a division of my prior application Serial No. 353,423, filed January 23, 1920.

The object of the invention is to provide a new and improved form of stoker bar especially designed for use with this type of stoker grate wherein the bar consists of side members to be rockably connected to the bearing-bars and a connecting shield for the side members, together with grate sections detachably connected with the shield and the side members.

In the drawings Figure 1 is a vertical section of the improved stoker bar,

Figure 2 is a view of one end of the said bar with the detachable elements removed,

Figure 3 is a view similar to Figure 1 but with the detachable elements of the bar removed,

Figure 4 is a plan view of parts shown in Figure 2,

Figure 5 is a transverse vertical section of the removable supporting bar,

Figure 6 is a side view of a part of the same,

Figure 7 is a side view of one of the removable grate sections, I

Figure 8 is a plan view of the same Figure 9 is an end view looking from the right Figure 10 is an end view looking from the left Figure 11 is a side view of another form of grate section.

In the present embodiment of the inven- Serial No, 433,596.

tion, the stoker bar comprises a pair of side members 1 each provided with a trunnion 2 for engaging the inclined bearingbars, and these side members are connected by a curved perforate shield 3. This shield has openings 4 for receiving bolts 5 for connecting a lug 6 to the shield, the said lug being adapted for connection with operating mechanism for rocking the. bars.

The stoker bar is provided with a number of removable grate sections, each of which comprises a longitudinal member 7 provided on each side with lugs 8 for spacing the members apart when the sections are assembled on the frame of the stoker bar.

The section has at one end a depending lug 9, which is connected to the bar in spaced re lation as shown, and this lug is adapted to engage in front of a rib or ridge 10 on the upper edge of the shield 3. Referring to Figures 1 and 3, it will be seen that the upper edge of the shield is spaced below the upper edges of the side members 1, and the said upper edge of the shield is rabbeted on its outer face to form the rib or ridge 10, and the lug 9 is so spaced with respect to the longitudinal member 7 that it will engage outside of the ridge 10 when the grate section is in place.

Referring to Figure 7 it will be noted that the forward end of the grate section, that is that end which abuts the concave face of the shield 3 is curved to fitsaid shield smoothly when the lug 9 is engaged with the ridge 10. The lug 9 as is evident from an inspection of Figures 7, 8 and 10 extends on both sides of the body or longitudinal member 7 of the grate section.

At the opposite end from the lug 9 the body 7 of the grate section is notched deeply as shown at 11 to form a tongue 12 at the lower edge of the section, and this tongue is cut away, so that the tongue is about half the length of that portion of the body of the grate section which is between the bottom of the notch and the end remote from the lug 9.

The side members 1 are connected at the end remote from the shield 3 by a crossbar 13.- This crossbar has at each end an extension 14 which extends on opposite sides of the bar and above and below the same when it is in normal position, and these we tensions 14 are received in vertical grooves 15 in the side members 1. At the bottom of (ill each of these grooves a lug 1G is provided against which the lower end of the extension abuts to limit the downward movement of the cross bar, and each extension and the adjacent side member have openings registering when the bar is seated on the lugs 16 for receiving a bolt indicated at 17 to detachably connect the parts.

The bar 13 has openings 18 at spaced intervals, which are adapted to receive the tongues 12, and they are so spaced with respect to the upper edge of the bar 13 that when the bodies 7 of the grate sections are seated on the upper edge of the bar l3'the tongues 12 will register with and enter the openings 18, as clearly shown in Figure 1. Thus an interlocking connection is provided.

In placing the grate sections, the bar 13 is released from the side members, and the grate sections are connected with the bar, by engaging the tongues 12 with the openings 18. Then the extensions ot the bar are seated in the grooves 15 and the lugs 9 are engaged with the ridge 10. Afterwards the bolts 17 may be put in place. The several grate sections are now held securely in place on the stoker bar so that they will not lift therefrom when the bar is tilted and any change in length of a grate section will cause the latter to slide over the cross bar 13, the outer edge of said section meantime remaining in alignment with the outer face of the curved shield.

In Figure 11 there is shown a modified construction of grate section, wherein the section 20 has a tongue extending inwardly from the end thereof, and adapted to enter one of the recesses in the supporting bar. In this construction the'tongue enters from the rear instead of from the front,

lVhat I claim is:

1. A grate structure comprising side members connected at one end by a shield, a crossbar connecting the side members at the other end and detachable from said members, and grate sections having interlocking connections at their ends with the shield and with the crossbar and releasable upon detaclnnent of the crossbar from the side mem-.

bers, the grate sections extending above the crossbar and above the upper edge of the shield and resting upon and covering said upper edge and crossbar to protect the same.

2. A grate structure comprising side mem bers connected at one end by a shield, a crossbar connecting the side members at the other end and detachable from said members, and grate sections having interlocking connections at their ends with the shield and with the crossbar and releasable upon detachment oi the crossbar from the side mem bers, the grate sections extending above the crossbar and above the upper edge of the shield and resting upon and covering said upper edge and crossbar to protect the same, the connection between the crossbar and the sections being released by moving the sections laterally of the bar.

3. A grate structurecomprising side members connected by a shield, -a crossbar detachably connected to the side members and provided with apertures, a plurality of grate sections resting upon the upper edge of the shield and the bar and covering said upper edge and bar to protect the same, each of the said sections being provided with a tongue engaging an aperture in the crossbar, to prevent lifting of the sections, the sections having transverse grooves and the shield having a rib for engaging the grooves to prevent movement of the sections transverse to the shield.

4. A grate structure comprising side members connected by a shield having a rib extending longitudinally of its upper edge grate sections resting upon the said upper edge and having transverse grooves for receiving the rib, and covering said upper edge, a crossbar detachably connected with the the side members and having apertures, the grate sections resting upon and covering the crossbar, and each sl-ectiofn having a tongue for engaging one of said apertures.

In testimony whereof I aflix my signature.

GEORGE HURNELL TEACHER, Jr. 

